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4hv.org :: Forums :: General Science and Electronics
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Crystal Radios

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Carbon_Rod
Tue Oct 10 2006, 01:58AM
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
TDU,
I had one like that when I was a kid too.

Nik,
I also built the No-Battery radio. However, I just used a low power diode instead of a rusty razor blade.

Very cool, So now where’s the transmitter? ;D
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...
Tue Oct 10 2006, 02:07AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I built my first AM radio out of a more modern kit than that, but it was still pretty crude wink

Simple 1n34 germanium diode, 32awg wire around a toilet paper tube, piezo speaker, etc. I forget how the reception was, but I remember picking am710 'Rado Disney' tongue

I also built a little am transmitter a few months ago, 1mhz crystal oscillator->300r base resistor->2n3904 transistor->coil of wire/ceramic cap (forgot the values), which I could pick up on my radio (but there was some mexican station from like 900-1100 so I couldn't do much on the range testing). Too bad there was ~10 years between their existences angry

Good times- first motor, blowing up LED's, electrolysing water with a big stack of 9v's, etc

Oh, and don't forget those kits with the little springs that you can run pieces of wire arround to make simple circuits!
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